Dental film mount



Sept. 4, 1923.

M. B. HODGSON DENTAL FILM MOUNT Filed Oct. 26

-5. HEAL. Fla

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Patented Sept. 4, 1923.

mos rrica.

MILLARD B. HODGSON, OF ROCHESTER, NEW YORK, ASSIGNOR TO EASTMAN KODAKCOMPANY, OF ROCHESTER, NEW YORK, A CORPORATION OF NEW YORK.

DENTAL FILM MOUNT.

Application filed October 26, 1920. Serial No. 419,757.

To all whom it may concern:

Be it known that I, MILLARD B. Hooo-' genographic negatives so that theymay be examined bytransmitted light, and so that they may be readilyfiled.

he objects of my invention are to provide such a mount that will beeasily manufactured, into which the film may be placed with the minimumof care, and which will hold the film securely against accidentaldisplacement, but which will permit of its removal. Other objects appearhereinafter.

I attain these objects by constructing the mount with a window that willtransmit light, around which window is a marginal portion coated with aslow-drying adhe sive to which the margin of the negative will adhere bypressure, and around this margin is a centering frame within which thenegative fits, thus insuring its proper location with respect to theadhesive and the window.

Reference will now be made to the accompanying drawing in which likereference characters refer to like parts, and in which Fig. l is a planView of my improved mount.

Figs. 2 to 8 are respectively sections of different constructions of myimproved inount, Fig. 5 being taken on the line 5-5 of F ig. 1, anddifi'ering in details that will be pointed out in the full descriptionfollow- My mount consists in general, of a front film-centering sheetwhich is designated A in all of the forms shown, and which has anaperture 1 of a size and shape to fit the particular film with which itis intended to be used, and of a back sheet which is shown as differingin construction in the different figures. In all forms, however, theback sheet has a central light transmitting window 2 smaller than, butregistering centrally with, the aperture 1, and it carries on the marginaround this window and within the against it.

aperture a coating of a slow-drying adhesive 3, the desiredcharacteristic being that the adhesive shall remain tacky for a verycons derable length of time. While the par-, ticular composition of theadhesive is not of importance, it is preferably a composition of rubberand coal tar pitch with any suitable softener, such as benzol, gasolineor chloroform. Thisremains for a long time sufiiciently adherent to holdan ordinary film when the latter is merely pressed Compositions such asthat mentloned are well known and are used for adheslve tapes of variouskinds, such as that known as surgeons tape.

In the form shown in Figure 2, there is a sheet 40 having a centralaperture 20, covered by a strip of pyroxylin 21 which may be clear ortransparent. A mask 30 of fiexlble material is coated with adhesive 31,and placed on the pyroxylin sheet, the inner edge of the maskregistering with the edge of aperture 20. This whole assemblageconstitutes a back member of the mount and is placed behind the frontmember A, with the apertures registering centrally and the outer edgeofthe mask carrying the adhesive extending beyond the edges of theaperture 1. There is thus left a margin of adhesive wlthm the aperture1, and surrounding the hght transmitting window formed by the aperture20 covered by pyroxylin 21.

In the form shown in Figure 3, the sheet,

41 has a central aperture 22, covered by a pyroxylin sheet 23, to whichis applied a band of adhesive 32 the inner edge of which registers withthe edge of aperture 22, and the outer edge of which fits just withinthe aperture 1 when the elements are assembled.

The sheet 32 and sheet 23 with theadhesive thereon comprise the backmember of the mount.

In the form shown in Figure 4, the sheet 42 has a central aperture 24,covered by a pyroxylin sheet 25 to which is directly applied the borderof adhesive 33, the inner edge of which registers with the edge ofaperture 24, and Which extends beyond the edges of aperture 1 when theparts are assembled.

In the form shown in Figure 5, which is my preferred form, a sheet 43,preferably of opaque fabric has an aperture 26. The entire surface 0 thesheet is coated with adhesive 34 of the type described. This form ofmount is particularly easy to make since a long strip of fabric may beevenly coated, and passed through a stamping machine that cuts out theapertures, while a long strip of opaque paper is passed through anothermachine which cuts out suitably spaced and shaped apertures and the twostrips are then joined by pressure only, in proper registry and outbetween the apertures. A film B is indicated in dotted lines.

In the form shown in Figure 6, the sheet 44 has an aperture 27, and amargin of adhesive 35 around this aperture and fitting within theaperture 1.

In the form shown in Figure 7, the sheet 4-5 has the aperture 28 with aborder of adhesive 36 around it, and extending beyond the edges ofaperture 1 when the parts are assembled.

In the form shown in Figure 8, the sheet 46 has the aperture 29, with amask 37, carrying adhesive 38, fitting around it, the mask and adhesiveextending beyond the edges of aperture 1 when the parts are assembled.

In the preferred form, shown in Figure 5, the adhesive alone holds theelements together, but in the other forms it is necessary or desirableto employ other securing and binding means. Various alternative meansmay be used such as are shown in the several figures. These may comprisespacing strips 50, coated on each surface with adhesive 51; eyelets 52;stitching 53 or 54;

edge binding 55 or 56; or wire fasteners 57, and these fastening meansmay be secured as shown at any desired points in the mount.

In use the negative is sli ped into the aperture 1 of a holder and sincethe negative and aperture are correspondingly shaped, the negative willbe at once correctlv centered. It is then pressed down firmly around theedges and will at once be held in the mount ready for use. If the formshaving a celluloid sheet are used the emulsion side of the negative isplaced against this sheet so as to be protected against injury. It isintended that these mounts shall constitute filing means for thenegatives, which are thus permanently mounted on them, but should it bedesirable for any reason to remove the negative, this can be done sinceit can be stripped from the adhesive without injury to its diagnosticvalue.

The mount thus made, articularly in the preferred form, is obvious ysimple in manufacture and in use. It has no protruding nor movable partsthat engage other mounts or that can break ofi. It is thin and easilyfiled; the films are mounted with the greatnames est ease and can bereadily removed. It is not necessary, as in some mounts, to slide thefilm behind a frame, or to Insert its corners painstakingly throughslits or under tabs that are liable to break and that usually causeannoyance. It is only necessary to lay it in the countersunk opening,the edges of which act as locating abutmen ts and press it slightly atthe edges. While I have described the mount as used with dental X-raynegative films, it is obvious that any image-bearing sheet, difieringwidely in form and material, .may be placed in a mount, the structure ofwhich embodies m invention, and I contemplate all suci i changes andequivalents as falling within the scope of the appended claims.

Having thus described my invention what I claim as new and desire tosecure by Letters Patent is:

1. A holder for an individual X-ray dental film comprising a backingsheet having a light-transmitting viewing portion, a second sheetattached thereto and having an opening, the first named sheet havingjust within the periphery of the said opening a. narrow strip ofslow-drying adhesive coating material, whereby a film shaped to fit saidopening may be placed therein and will be removably held in place at itsmargins only by the narrow strip of adhesive ma terial.

2. A mount for an individual X-ray dental film comprising a fabricbacksheet with a viewing opening, and coated upon its entire front surfacewith a slow-drying adhesive material, and a front sheet with an openinglarger than said first named opening, the front sheet adhering to thecoating, the openings in the two sheets being so located that anadherent margin will remain around the smaller opening and within thelarger opening, whereby a dental film shaped to fit said larger openingwill be properly located by the edges thereof and may be adhesively butremovably attached by the use of pressure only, and at the margins only,to the back sheet and within the aperture in the front sheet.

3. A transparency comprising a backing sheet having a light-transmittingviewin portion, a second sheet attached thereto and having an openinglarger than said viewing portion, an image-bearing, light-transmittingsheet fitting within said opening and attached at its margins only, bymeans of a slow-drying adhesive composition, to the backing sheet.

Signed at Rochester, New York, this 22nd day of October 1920.

MILLARD B. HODGSON.

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